我厂常年都要生产柴油机配件——增压器镶套锻件,批量大,材料均是5CrNiMo,其塑性差,变形抗力大,给制定锻造工艺和选用(?)具材料带来一定困难。我们原采用胎模—自由锻联合工艺,生产效率低,锻件质量差。后来我们采用拉延—挤压联合工艺,用胎模锻造制坯(制坯模见图2),把原材料锻成圆盘,冲孔后用胎模拉延—挤压初变形工艺 Our factory perennial production of diesel engine parts - Turbocharger set of forgings, large quantities, the material is 5CrNiMo, its poor plasticity, large deformation resistance to the development of forging process and selection of materials (?) With certain difficulties. We used the original mold - free forging joint technology, low productivity, forging poor quality. Later, we use drawing - extrusion joint process, forging the blank with a tire mold (blank mold shown in Figure 2), the raw material into a disk, after punching the tire with a model - early extrusion extrusion process